fix: fix sometime onfinish not invoke

[Aarebecca]

🤔 This is a ...

• [ ] New feature
• [x] Bug fix
• [ ] Site / Document optimization
• [ ] TypeScript definition update
• [ ] Refactoring
• [ ] Performance improvement
• [ ] Code style optimization
• [ ] Test Case
• [ ] Branch merge
• [ ] Other (about what?)

🔗 Related issue link

💡 Background and solution

camera.gotoLandmark 有一定概率不会执行 onfinish 回调函数

问题原因： requestAnimationFrame 计时误差导致小概率情况下 elapsed === duration 从而不会执行下一帧而无法执行 endAnimation 方法

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camera.gotoLandmark will not execute the onfinish callback with some probability

Cause: a timing error in 'requestAnimationFrame' causes a small probability of 'elapsed === duration' which prevents' endAnimation 'from executing the next frame

📝 Changelog

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• [x] Doc is updated/provided or not needed
• [x] Demo is updated/provided or not needed
• [x] TypeScript definition is updated/provided or not needed
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